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Alumina High Aluminum Smelting

Hangzhou JWG Technology Co.Ltd | Updated: Sep 05, 2017

Bauxite is alumina. According to its use, it is divided into metallurgical, chemical, fire-resistant, grinding and cement levels. The bauxite is used to make refractory materials. AL2O3 / Fe2O3 and AL2O3 / SiO2 proportion are suitable for alumina clinker, which is used to melt alumina and AL2O3 / SiO2 with appropriate bauxite clinker, which is used to melt alumina

The main minerals of bauxite in China are alumina (monohydrous alumina), boehm (a water soft bauxite), kaolin and pyrophyllite. It is often contained impurities such as kaolinite, iron ore and titanium minerals. It can be divided into water-alumina - kaolinite type (DK), boehmstone-kaolinite type (BK) and hydroxanthole-pyrophyllite type (DP), which is mostly DK type. Sintering DK type bauxite clinker generally according to its content, divided into special, Ⅰ A12O3, Ⅱ A etc, Ⅱ B and Ⅲ, etc. The sintering of DK bauxite is closely related to its A12O3 content. The content of alumina is closer to the composition of mullite and harder to sintering. The two main factors that influence the sintering of bauxite are the secondary mullitization and liquid phase. The main chemical components of bauxite are Al2O3, SiO2, Fe2O3, TiO2, accounting for 95% of the total components, the secondary components are CaO, MgO, K2O, Na2O, MnO2 and organic matter and trace elements Ga, Ge, etc. Three alumina bauxite is the main chemical composition, and its form is mainly aluminum hydroxide, followed by aluminum silicate clay minerals content, namely silica generally exists in the form of clay minerals content, quartz is rarely free. The mineral of bauxite raw material in China is mainly monohydrous alumina mineral, a small amount of aluminum and aluminum stone mainly, and the individual regions are mainly three - water alumina mineral. The content of alumina is generally between 45 and 80 %. Bauxite the growth and decline of the aluminum silicon content relationship is on the contrary, most of the content of ferric oxide between 1% ~ 1.5%, the content of calcium and magnesium is lower, the content of potassium, sodium, generally less than 1%, the content of TiO2 is in commonly 2% ~ 4%, alumina loi is approximately 14%.

High alumina smelting alumina

Intensive smelting and blast furnace longevity project have become the main work of modern blast furnace. Long life aspects in blast furnace, the daily maintenance of blast furnace hearth iron with stemming have very good effect, and strengthen the smelting and longevity work again on the taphole blast furnace with stemming increasingly stringent requirements are put forward.

In requirements, protect the hearth of blast furnace of long work is important, therefore must demand stemming in smooth out iron at the same time also can maintain stable and enough iron mouth depth, to alleviate the taphole damage around the hearth carbon brick, so as to achieve the purpose of protecting hearth. At present, the mortar suppliers can improve the performance of the mortar to meet the requirements of the blast furnace by improving the quality of raw materials and the introduction of high efficiency admixture. But the application of these technical measures improves the technical cost of high-performance mortar and reduces its cost performance. The chemical composition of bauxite products and the ore are relatively stable. In view of this, the use of alumina was used to replace the high price of the high - price brown corundum in the high - performance - water cannon clay to enhance the cost performance.

Hangzhou JWG Technology Co.Ltd